Improvement in adjustable crown-blocks for hat-blocking machines



' zaheetv-She etl,

WILLIAM C. GRISWOLU.

Improvement in Adj-u stable Crown Blocks for Hat Blocking Machines.

Nb, 120,739, Patentg d Nov.7,1871.

impr ov ement in Adjustable Cro wn Blocks for Hat Bldckihg Machines.

N0. 120,739. Pate nted Nov 7,1871.

WILLIAM C. GRISWOLD, OF NEWARK, NEW JERSEY.

IMPROVEMENT IN ADJUSTABLE CROWN-BLOCKS FOR HAT-BLOCKING MACHINES.

Specification forming part of Letters Patent No. 120,739, dated November7, 1871.

. levers, as is more fully hereinafter described.

In the accompanying drawing, Figure 1 is a top view, showing the blockexpanded; Fig. 2, a similar view, showing the block contracted; Fig. 3,a perspective side view, showing the expanding-levers; Fig. 4, a sideview, and Fig. 5 a detail view of one of the levers.

The adjustable ring a a is made of suitable metal in two segments, oneof which overlaps the other, each part being furnished with slots andstuds, as shown in the drawing, so that the ring may be expanded andcontracted to change its size, and at the same time its parts be heldrigidly together at the point where they overlap. To the interior ofeach segment of the ring sliding armsb b b b are hinged, the connectionbein g to suitable projections or lugs 09 m fixed thereon. Theiropposite ends are united by a pin, forming a hingejoint, as at c 0. Oneset of these sliding arms overlaps the other, and both are guided uponstuds 0 0, which pass through the elongated slots i t as they are movedto and from the center, to expand or contract the ring, by the el'bow-levers d 61, whose upper ends are forked to grasp the slides attheir junction 0 c. The operating-levers are pivoted at their bend c tolugs attached to the base of the machine, and hinged at f to theprojecting arms of a sleeve sliding on the shaft 9, and raised andlowered by the lever q. Curved arms g g are pivoted to the base of thesliding arms I) b, and are carried forward and backward with them asthey move to expand and contract the ring. Their outer ends bear uponthe sides of the oval ring, against which they are forced by their camedges'bearing against the fixed studs 0 0. As the segments of the ringare forced apart by the slides 11 b, it will be observed that the arms gg are moved in concert therewith against the sides of the oval, and thuspreserve its form as its size is increased or diminished. The main frameon of the machine is recessed to receive the elbow-levers (1 cl, and hasa flat table, upon which the slides are supported and move. From itsbottom a shaft, 9, projects,

to the end of which a simple lever is attached, by which the block israised and lowered in the process of blocking.

I have shown and described the slides b b as hinged to the ring and attheir rear ends. I contemplate using a T or U-sh'aped slide moving inright lines, which will overcome the necessity of hinge connections.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, 1s

1. A crown-block for blocking-machines, consisting of a segmental ringexpanded and contracted by slides and levers, substantially asdescribed.

2. In combination therewith, the cam-arms g for preserving the properrelative position of the sides of the oval, substantially as described.

WILLIAM G. GRISWOLD.

MUNSON G. DoREMUs. (76)

